What are the opening hours?

Monday 4:30am - 8:30pm Tuesday 4:30am - 8:30pm Wednesday 4:30am - 8:30pm Thursday 4:30am - 8:30pm Friday 4:30am - 7:15pm Saturday 7am - 12:45pm Sunday 7am - 12:45pm

Orangetheory Fitness Thornton

Home
United States
Thornton, CO
Orangetheory Fitness Thornton

Orangetheory Fitness is heart rate zone training that delivers a full body group workout.
(552)

Orangetheory Fitness in Thornton, CO offers heart rate zone training that delivers a smarter way to work out. Experience an expertly designed, full-body group workout combining cardio and strength training with real-time tracking for measurable results you can see and feel. Here in Thornton, your heart rate sets the pace, enabling our triple-certified coaches to get you into the optimal zone. The result is a personalized fitness experience tailored to your fitness level.

09/03/2025

Calling all strength stars: your DriTri dress rehearsal is today. 🎬 Supersets in Act 1, full performance in Act 2. Spoiler: there will be sweat. 💦 Who's ready for the real deal after that?

09/02/2025

Meet Natasha from OTF Estero 🧡

For Natasha, More Life isn’t just about milestones — it’s about moments. The ones where she’s running side by side with her son. Laughing. Moving. Living fully.

She never imagined she’d run 50+ miles during Marathon Month or complete the DriTri — but she did. She pushed beyond what she thought was possible.

“By challenging my body in ways I didn’t think I could,” she says, “I’ll be able to keep running and playing with my son for a lifetime.”

Because every rep, every step, is building a lifetime of moments that matter most.

09/01/2025

You’ve been building up to this. Every rep, every meter, every minute. DriTri isn’t just a challenge, it’s a celebration of how far you’ve come. Whether you go Full, Sprint, Strength, or Team … just know: You’re not starting from scratch. You’re starting from strength. And you’ve got tri-hard written all over you 🧡

📆 Sept 19-21. Let’s go. Register now on the mobile app or at the front desk.

08/31/2025

That post-finish line glow? You wear it well 🌟 A month of sweat, smiles, and serious mileage — now drop your distance and let the celebration begin ⬇️🏅

08/29/2025

Milestones on the board. Vibes through the roof. 📈✨

08/27/2025

It’s not fall until your legs are sore and your coffee’s seasonal. Press, squat & lunge for joy — we brewed this one just for you ☕️🏋️‍♀️

08/26/2025

Since joining Orangetheory Lawrence in September 2024, Andres has been on a mission to live a more active, balanced life — and he’s doing just that.

Originally from Costa Rica and now studying supply chain management and accounting at KU, he’s juggling workouts, recovery, and academics with heart and hustle. His favorite part of OTF? The community. Because nothing beats the kind of motivation that comes from pushing through a tough block side by side with friends.

Since starting, Andres has gained strength and built muscle, and he's now working toward bouncing back from a knee injury — one step at a time. All with Timber on blast and the Jayhawks in his corner. 🏀

We’re cheering you on every rep of the way, Andres!

08/26/2025

We show up for our health, our goals, and the ones waiting at the door when we get home. Let’s see your biggest supporter. Drop a photo of your dog in the comments 🐶🧡

08/25/2025

There are many people that will put you down. Don’t be one of them.

08/22/2025

We’ll never shut up about your milestones. 📢✨ Goals smashed, birthdays celebrated, firsts crushed — we’re obsessed.

08/19/2025

OTF Forest Acres wouldn’t be the same without Lauren! Since 2018, she’s brought nonstop dedication — in the studio, at home with her two kiddos and husband, and on walks with her Bluetick Hound, Remy 🐾. Thanks for showing up, shining bright, and inspiring us all! 👏

08/18/2025

She’s not for the weak — 2000m Row Benchmark: equal parts petty and painful. May your legs be strong and your lungs be stronger. How’d you do? 👇😮‍💨

08/27/2024

Start your September with a burst of energy! Gather your friends and family for a fun-filled 5k event on the 1st at 9am at the Labor Day Lift Off. Whether you run, walk, or jog, everyone can join in the excitement. Don't miss out on this opportunity to enjoy a great time together! Click the link in our bio to sign up!!

07/25/2024

Orangetheory at Labor Day Lift Off 5K registration is OPEN! This race is open to EVERYONE, member or non-member. Tell your friends, neighbors and co-workers to join in on the fun! And, because you are an AMAZING OTF Member, you receive $5 OFF Your Registration! Text the studio for your secret code!
-
🏃 When: Sunday, September 1, 2024 at 9am
👉 What: A beautiful 5K Loop around Memorial Park following Lift Off! Come early and watch 70 balloons take to the sky and enjoy shopping and vendors before the run!
✔️ Registration Fee: $25 with secret code! *Registration includes a t-shirt and medal!
🚗 Parking is FREE for all 5K participants. *Available on a first come first serve basis.*
💪 Register TODAY and Earn Your Orangetheory 5K Labor Day Lift-Off Medal.
-
Register https://runsignup.com/Race/CO/ColoradoSprings/LaborDay5kRunpresentedbyOrangeTheory

06/03/2024

Who: you and any family, friend, or fellow OTF member 🍊
What: a 5k run/walk course 🏃 (with only small hills) ⛰️
When: Saturday June 15th, 8:00am
Where: Highland Heritage Park, Highlands Ranch, CO
WHY: to experience a fun fitness event outdoors, all proceeds support Girls on the Run Rockies 🧡 🧡
scan the QR code at your studio to sign up now!

05/15/2024

Join us Sunday for fun workout to support Help for Heroes!
Who: any OTF member, friend, or family member! All are welcome! 🧡
What: a Solo or Team Marathon Row OR an Outdoor Workout! 💪
When: Sunday May 19th 9:00 am (outdoor workout starts at 10 am)
Where: Spice Trade Brewery Greenwood Village, CO 🍻
Why: to challenge our fitness in a new capacity and support Help for Heroes, a local non-profit supporting mental health treatment for Active and Retired Military personnel.
Registration includes a beer post workout and all proceeds are donated to Help for Heroes.
Counts as a Mayhem workout!!
sign up here! --> https://runsignup.com/Race/CO/GreenwoodVillage/RowforHeroesMarathon?utm_source=Run%2520Sign%2520Up%2520&utm_medium=medium&utm_campaign=Row%2520for%2520Heroes

05/15/2024

What an incredible day at the first ever Regional Dri Tri on Saturday! 💪

Congratulations to the winners Ty Roder and Karen Goldburg! And a huge shout out to everyone who participated and cheered everyone on! Thank you for creating such an incredible OTF community that we are so grateful to be a part of everyday. 🧡🧡🧡

We can't wait to see you all (and some new competitors) again next year! Until then, keep pushing and keep spending your time in the Orange zone!

04/19/2024

🎉 Exciting news alert!
For the first time ever ... OTF Colorado will be hosting a Regional Dri Tri Championship and we couldn't be more pumped! 🙌
Top Male/Female winners of the Full Dri Tri will be invited to compete together in a Regional Championship on Saturday May 11th.
This competition has never been done before and we can't wait to see the energy and determination our amazing Orangetheory community brings to the table. 💪
Check out the video for movement standards and more information!
Happy Dri Tri this weekend! 🧡

03/29/2024

MILE HIGH MORE LIFE WINNER!! 🎉 Congratulations to Frances Kelly from for finishing Transformation Challenge and winning $2024!! 💪
Shoutout to all 3,000 finishers in the OTF Colorado region for completing Transformation Challenge and finding under the orange lights.
🧡

03/07/2024

Ever wonder what the different colors mean at OTF?

Let’s talk about the different heart rate levels we measure at OTF! This helps us see where your cardiovascular health is at and how you can track your heart rate levels:

🔵 Blue - resting heart rate, very casual
🟢 Green - Base, Challenging But Doable
🟠 Orange - Push, getting uncomfortable
❤️ Red - Maximum Effort, very uncomfortable

When we take some time to train your heart to recover, we help it get stronger. Cardio is so important and when you’re able to track it, you can start to improve your heart health.

Leave a ❤️ to celebrate your heart this month!

02/27/2024

When the gym is your form of self-love 💘

So many people don’t go to the gym because they view it as a punishment. What if you changed your mindset and thought of the gym as self-care, a way to honor your body, me-time, or a privilege?

If you want to be more consistent with your fitness journey, change your view to every part of it as an act of self-love that you GET to do!

Leave a ❤️ if you needed to hear this!

02/27/2024

Countdown to the best you 🍊⭐

Improving your health is literally one decision at a time. The more you choose yourself, the more results you’ll see!

Leave a 💪🏼 if this left you motivated!

02/13/2024

While a lot of people have already given up on their New Year’s Resolutions, our Orangetheory community is still over here gettin it! 🍊🏋️🏃♀️

Studies have shown that when it comes to creating health and fitness goals, you’re much more likely to achieve those goals if you have support from others.

That’s why Orangetheory is hands down the best option out there! Not only do you get workouts that are backed by science, but you also get one of the best, most supportive communities out there.

Book your next workout today, bring an accountability buddy, and continue working towards your goals!

02/13/2024

Get pumped to team up with your BFFs this month for Palentine’s Day at OTF! 💘

Book your class for Wednesday, February 14th in honor of Valentine’s Day! Capture the Flag Partner workout is ready for you and your bestie, significant other, or fellow OTFer!!

Unsure about partner workouts?? Don't stress!! Your coach will match you up and make sure you have an amazing workout!

Tag your gym bestie! 👯

Address

4243 East 136th Avenue
Thornton, CO
80602

Opening Hours

Monday	4:30am - 8:30pm
Tuesday	4:30am - 8:30pm
Wednesday	4:30am - 8:30pm
Thursday	4:30am - 8:30pm
Friday	4:30am - 7:15pm
Saturday	7am - 12:45pm
Sunday	7am - 12:45pm

Telephone

+17209291649

Website

https://www.orangetheory.com/en-us/locations/colorado/thornton/4243-e-136th-ave/

Alerts

Be the first to know and let us send you an email when Orangetheory Fitness Thornton posts news and promotions. Your email address will not be used for any other purpose, and you can unsubscribe at any time.